Combustion-furnace.



No. 654,774. Patented -luly 3|, I900.

W. ,R. WUUD.

COMBUSTION FURNACE.

(Application filed Aug. 19. 1899-) (No Model.) Z SheetsSheet l.

1 I, by

NITED STATES PATENT OFF-1c.

, WILFRED ROTHERY WOOD, OF LONDON, ENGLAND.

COMBUSTION-FURNACE.

SPECIFICATION forming part of Letters Patent No. 654,774, dated July 31,1900.

Application filed August 19, 1899- Serial No. 727,759. (No model.)

To all whom it mag concern: 7

Be it known that I, WILFRED ROTHERY WOOD,engineer, a citizen of theUnited States of America, residing at I8 Walbrook, in the city ofLondon, England, have invented certain new and useful Improvements inOombustion-Furnaces, of which the following is a specification.

It has heretofore been proposed to use rising and falling and alsoreciprocating gratebars in furnaces of various forms, the objects beingto keep the fuel from caking or massing togetherto too great an extentand also to keep the draftways clear. Hollow bars through which air isinjected and stepped bars have also been proposed.

The present invention relates to what maybe called a fhollo'w-barstepped furnace; and it consists'in so. forming and mounting the barsthat when in their normal position" there is free access for the naturalorforced draft through the bars and fuel and no tendency of the fuel topass between the bars to the ash-pit, the bars being kept cool by theair passing through them and the amount of draft-inlet being capable ofregulation by varying the position of the bars, which may be moved untilat the extreme limit of their working position the draft is entirely cutoff and an even dead-plate furnace-bottom produced, the bars in reachingthis position having a cutting or shearing action on any fuel ormaterial lying in or adjacent to the draftinlets, which are thereby keptclear, which is a point that has hitherto been difficult to secure whenusing certain classes of fuel. Further movement may be imparted to thebars, so as to form discharge-openings between them and secure thedumping of any desired quantity of ashes to the ash-pit.

In order that the invention may be clearly understood, reference is madeto the accompanying drawings, in which- Figure 1 represents a side viewof a furnace composed of a series of the improved bars, the side of thefurnace being removed. Fig. 2 is a perspective View, upon a largerscale, of one of the grate-bars. Fig. 3 is a sectional View through anumber of the bars when in position for full draft. Fig. 4; is a likeview when the draft is entirely out off and a dead-plate cated in Fig.3, full draft will pass from wind boxD to and through the bars, asindicatedby arrows, and to reduce such draft it will be only necessarytoslightly move the bars until the rear upper solid portion of eachbarpartially closes the opening in the next adj acentb'ar, as indicatedby dotted lines in Fig. 3, while fur ther movement completely cuts offthe draft and at the same time efiectually cuts or shears off any fuelor gummy matters adhering at the outlets of the draft-openings; When thebars are in this position, as indicated in Fig. 4, a dead-plate isproduced which can be readily raked or scraped to loosen any adheringfuel, and the ashes may be discharged by further movement of the barsinto the position indicated in Fig. 5, and it is only when such bars arein thisposition that there is any tendency of the fuel or ashes to pass.through them.

. What is claimed is 1. In combustion-furnaces, grate-bars havingsubstantially box like crossesections the "space within the bars formingthe draft-inlet to the furnace and the top sections of such bars forming"the furnacebottom and the lower part of such bars in combination withthe top of the next adjacent bar forming a stop -plate extendingrearward from the draftopening to prevent the fuel passing between saidbars when in working position, substantially as described.

2. In combustion-furnaces, grate-bars having substantially box-likecross-sections the space within the bars forming the draft-inlet to thefurnace, and means for moving such bars so as to cause the rear topsection of one bar to move across the draft-opening between in rnace'is-produced, and Fig. 5 asimilar View when the bars are in position fordischarging the ashes into the ash-pit.-

through which thedraft passes and means for moving such bars and causingthe rear top face of one bar to cut or shear across the draftoutlet ofthe next adjacent'bar substantially as described.

4. In combustion-furnaces, grate-bars having substantially arbox-likecross-section and.v

through which the'draf t passes the top of such bars forming thefurnacebottom and the lower part of such bars in combination withstop-plate 'to'prevent fuel passing between such bars when in workingposition, and

means for moving such bars to form adeadplate, substantially asdescribed.

5. In combustion-furnaces,grate-bars having substantially a box-likecross-section and through which the draft passes the top of such barsforming the furnace -bottom and the lower part of such bars incombination with z 5 the top of the next adjacent bar forming astop-plate" to prevent fuel passing between such bars when in workingposition, and means for moving such bars to form a deadplate and finallyto open the spaces between 0 the-bars for discharge of fuel or ashes,substantiallyaslflescribed. In testimony'whereof I have hereunto set .nrr handin the presence of two subscribing -wi-tnesses. the top of thenext adjacent bar forming a WILFBED ROTHERY wool).

Witnesses: a g PHI-LIP JUSTICE, I

FRED O. HARRIS.

